/*
 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
 * with the License.  You may obtain a copy of the License at   *
 *                                                              *
 *   http://www.apache.org/licenses/LICENSE-2.0                 *
 *                                                              *
 * Unless required by applicable law or agreed to in writing,   *
 * software distributed under the License is distributed on an  *
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
 * KIND, either express or implied.  See the License for the    *
 * specific language governing permissions and limitations      *
 * under the License.                                           *
 */ 
package org.apache.rat.header;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.io.StringReader;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

public class FilteringSequenceFactoryTest {

    private int capacity;
    private FilteringSequenceFactory factory;
    private SimpleCharFilter filter;

    @BeforeEach
    public void setUp() throws Exception {
        capacity = 50;
        filter = new SimpleCharFilter();
        factory = new FilteringSequenceFactory(capacity, filter);
    }

    @Test
    public void noFiltering() throws Exception {
        final String INPUT = "Whatever";
        StringReader reader = new StringReader(INPUT);
        CharSequence result = factory.filter(reader);
        assertNotNull(result);
        String output = result.toString();
        assertEquals(INPUT, output, "No filtering so input equals output.");
        reader = new StringReader(INPUT);
        result = factory.filter(reader);
        assertNotNull(result);
        output = result.toString();
        assertEquals(INPUT, output, "No filtering so input equals output. Independent of previous input");
    }

    @Test
    public void filtering() throws Exception {
        final String INPUT = "Whatever";
        StringReader reader = new StringReader(INPUT);
        CharSequence result = factory.filter(reader);
        assertNotNull(result);
        String output = result.toString();
        assertEquals(INPUT, output, "No filtering so input equals output.");
        filter.filterOut = true;
        reader = new StringReader(INPUT);
        result = factory.filter(reader);
        assertNotNull(result);
        assertEquals( 0, result.length(), "All filtered output is empty. Independent of previous input");
    }
    
    @Test
    public void overCapacity() throws Exception {
        final String INPUT = "WhateverWhateverWhateverWhateverWhateverWhateverWhateverWhateverWhateverWhatever";
        StringReader reader = new StringReader(INPUT);
        CharSequence result = factory.filter(reader);
        assertNotNull(result);
        String output = result.toString();
        assertEquals(INPUT.substring(0, capacity), output, "No filtering so input equals output.");
    }
}
